import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
Vue.use(VueRouter)

const routes = [
  {
    path: '/', redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
  path: '/home',
  component: Home, 
  redirect: '/welcome',
  children: [
    { path: '/welcome', component: Welcome }, {path:'/users', component:Users}
  ]
  }
  
]

const router = new VueRouter({
  routes
})

router.beforeEach((to, from, next) => {
//to 将要访问的路径
//from 代表从那个路径来
//next 是一个函数
// next （）方放行 next（'/login'）强制跳转

if(to.path === '/login') return next()
//token 
const tokenStr = window.sessionStorage.getItem('token')
if(!tokenStr) return next('/token')
next()
})
export default router